They seem to be affecting your grammar.
No.
No.
no
Nothing is bad about the US, except the illegal immigrant's.
If they obtain a visa, they are not illegal.
Yes he has to be born in us
inside the us
You can't.
Your question reveals an unconscious bias. You said,= "How can a US citizen sponsor an illegal immigrant...." = If you "sponsor" them, they are not an "illegal immigrant." Careful, the way your question is phrased says a lot about you. The very term "illegal immigrant" is insulting to ....migrant workers, especially. Mexican citizens surely don't like the phrase and, by the way, Superman was apparently an "illegal immigrant" and you SURELY wouldn't want to insult HIM.
It is legal in the United States for an illegal immigrant to marry a US citizen. Once the marriage is legal, the illegal immigrant becomes a legal immigrant and can stay in the US for the course of the marriage.
only if the person marries a US citizen
No he cannot